try.

try. / catch. 控制結構 is used in 明確定義(:).

try. B0 catch. B1 end.

B0 block is executed與if an error occurs, B1 block is executed.

例如:

f=: 4 : 0
 try.
  try. 3+y. catch. *:x. end.
 catch.
  'x與y are both bad'
 end.
)

   13 f 7
10

   13 f 'primogeniture'
169

   'sui' f 'generis'
x與y are both bad

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